package collection.stream;



import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;

public class StreamApiDemo {
    public static void main(String[] args) {
        Random rand = new Random();
        List<Integer> list = new ArrayList<>();
        for (int i = 0;i<10;i++){
            list.add(rand.nextInt(10));

        }
        System.out.println(list);

        List<Integer> list2 = list.stream()
                                  .map(e->e*3)
                                  .collect(Collectors.toList());
        System.out.println(list2);




        List<Integer> list3 = list.stream()
                                  .filter(e->e%2==0)
                                  .collect(Collectors.toList());
        System.out.println(list3);


        List<Integer> list4 = list.stream()
                                  .distinct()
                                  .collect(Collectors.toList());
        System.out.println(list4);



        List<Integer> list5 = list.stream()
                                  .sorted((e1,e2)->e2-e1)
                                  .collect(Collectors.toList());
        System.out.println(list5);

        //对集合每个元素扩大三倍并获取其中所有的偶数然后去除集合重复元素并降序排列\
        List<Integer> list6 = list.stream()
                                  .map(e->e*3)
                                  .filter(e->e%2==0)
                                  .distinct()
                                  .sorted((e1,e2)->e2-e1)
                                  .collect(Collectors.toList());
        System.out.println(list6);































    }
}
